Receiving device for code combinations for a teleprinter of the start-stop type

ABSTRACT

A receiving device for a start-stop teleprinter comprises a shifting register adapted to serially receive a code combination and to transfer in parallel the received combination to a temporary storing register for simultaneously controlling a set of code electromagnets. A start electromagnet adapted to cause a printing mechanism to be cyclically operated is controlled by a bistable control circuit, which is set by a character ready signal generated upon receiving the code combination. The circuit then clears the storing register and is reset by a signal generated upon sensing at least one element movable with said mechanism.

United States Patent Inventors Appl. No.

Filed Patented Assignee Priority RECEIVING DEVICE FOR CODE COMBINATIONS FOR A TELEPRINTER OF THE START-STOP TYPE 11 Claims, 4 Drawing Figs.

US. Cl

Int. Cl

178/36 1104115/24 Field ofSearch 178/36, 33, 27, 26, 2s

[56] References Cited UNITED STATES PATENTS 3,236,940 2/1966 Chaskin .r 178/33 3,450,837 6/1969 Ricciardi et al 178/33 Primary Examiner-Kathleen l-l. Claffy Assistant Examiner-Thomas W. Brown Ar1orney-Birch, Swindler, McKie & Beckett ABSTRACT: A receiving device for a start-stop teleprinter comprises a shifting register adapted to serially receive a code combination and to transfer in parallel the received combination to a temporary storing register for simultaneously controlling a set of code electromagnets. A start electromagnet adapted to cause a printing mechanism to be cyclically operated is controlled by a bistable control circuit, which is set by a character ready signal generated upon receiving the code combination. The circuit then clears the storing register and is reset by a signal generated upon sensing at least one element movable with said mechanism.

DECODER PULSE COUNTER PATENTED SEP14|97| 3504.851

SHEET 1 0F 2 INVENTORS BR UNO SANDRONE GIUSEPPE RICCIARDI RECEIVING DEVICE FOR CODE COMBINATIONS FOR A TELEPRINTER OF THE START-STOP TYPE BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiving device for code combinations for a teleprinter of the start-stop type having a printing mechanism cyclically operable to print a received character, a start electromagnet for conditioning said mechanism for operation, a storing register for storing each time the code combination of the character to be printed and a series of code electromagnets to'control said mechanism to select the character to be printed in accordance with said code combination.

2. Description of the Prior Art Known devices comprise a printing mechanism adapted to be actuated cyclically to print a received character, a register adapted to store from time to time a code combination corresponding to the character to control a series of code electromagnets, a start electromagnet for the printing mechanism and delay means for controlling the clearing of the register.

In one known receiving device of this type, both the register and the code electromagnets are operated selectively in accordance with the code combination received under the control of a clearing circuit which, through the medium of delay means, keeps the received code combination in the register for a time substantially equal to a cycle of the machine. This arrangement therefore does not permit control of the register and the code electromagnets by means of the printing mechanism of the machine, so that its operation is not very reliable.

SUMMARY OF THE INVENTION The object of the invention is to provide a receiving device controlled by an electronic register which will obviate this drawback, the register being cleared under the control of the printing mechanism itself. According fo the invention we now provide a receiving device for code combinations for a teleprinter of the start-stop type, comprising a printing mechanism adapted to operate cyclically in response to a start electromagnet to print a received character, a series of code electromagnets which control the mechanism to select the character which is printed in accordance with a code combination stored in a register, means for providing a character ready signal in response to receipt of a code combination, a control circuit responsive to the first signal to change. from a first state to a second state to actuate the start electromagnet, and delay means controlled by the mechanism to reset the control circuit to the first state with a predetermined delay with respect to the actuation of the start electromagnet, the control circuit being arranged to clear the register on reverting to the first state. Such a device can be constructed with the utmost simplicity and reliability of operation.

The invention will be described in more detail, by way of example, with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial perspective view of the printing mechanism of a teleprinter with a receiving device embodying the invention;

FIG. 2 is a block diagram of the receiving device;

FIG. 3 is a side view of the receiving device from the right and.

FIG. 4 is another side view of the receiving device from the right.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, the usual driving shaft 2 of a teleprinter is rotated anticlockwise conti upusly in manner known per se by an electric motor not show in the rawing. On the shafl 2 there is fixed a pulley 3 connected by means of toothed belt 4 to a second pulley 6 with twice the diameter and fixed on a grooved shaft 7. The shaft 7 is adapted to actuate synchronously and cyclically a device for selecting the character to be printed, substantially in the manner described in the specification of our U.S. Pat. No. 3,404,765. More particularly, the device for selecting the character to be printed comprises a series of synchronous clutches with teeth missing and which are indicated generally by the reference 8, only one of these clutches being visible in the drawing.

Each clutch 8 is of the type described in the specification of our US. Pat. No. 3,260,128 and comprises a driven part 9 having a gear 11 with teeth missing and two diametrically opposite projections 12 and 13 in correspondence with two portions devoid of teeth and offset axially. Each clutch 8 moreover comprises a driving part 14 rotatable on a fixed shaft 16 and having a gear 17 and a pair of diametrically opposite initiating dogs 18 for producing the initiation of the rotation of the driven part. The gear 17 is in constant engagement with a corresponding pinion l9 fixed on a sleeve 21 which is angularly fast with, but slidably axially on, the shaft 7.

The clutch 8 can be closed or engaged by shifting the driving part 14 from one to the other of two axial positions in any angular position of the driving part 14, with exception of two arcs in which one of the dogs 18 interferes with one of the projections 12 and 13 if the clutch is open, these arcs corresponding to the initiation period when the clutch is closed. The clutch 8 opens or is disengaged automatically after a rotation of The driving part !4 of each clutch 8 has its dogs 18 so phased that all the clutches 8 are closed simultaneously and is connected to a lever 22 pivoted at 23 and provided with a notched lug 24 embracing a corresponding code bar 26. Each bar 26 can be turned in the frame of the machine between two different positions by means of two pivots 27 under the control of the signals representing the code combination received from the selection of the character to be printed. The code bars 26 must therefore be set simultaneously and at a predetermined phase in the rotation of the shaft 7, while the cycles of the selection clutches 8 can follow one another synchronously at the rate of two for each revolution of the shaft 7.

The teleprinter is adapted to receive eight-bit code combinations and comprises an electronic receiving unit indicated generally by the reference 31 in FIG. 2. The receiving unit 31 receives the coded data from an output line 32 of an amplifying input stage 33 connected directly to the telegraph line 34. The line 32 is connected to a distributor constituted by a shift register 36 of a type known per se and formed by eight bistable flip-flops. The shifting of the telegraph signals to the register 36 is controlled by signals of telegraphic frequency which are supplied to a line 37 by an oscillator 38. This oscillator is normally inoperative and can be activated by a signal on an input line 39 from a start circuit of a type known per se which is constituted by a flip-flop 41. The circuit 41 is normally deactivated and can be activated by the falling front edge of the start signal of each code combination arriving on the line 32.

The distributor 36 is connected on its output side to a storage register 42 by means of eight lines 43, each provided for one bit of the parallel code. The transfer of the code units from the distributor 36 to the storage register 42 can take place only when the distributor 36 is completely filled. To this end, there is provided an electronic control circuit comprising a pulse counter 44 having four binary places and a decoder 46 for the binary number nine. The counter 44 is adapted to count in binary the pulses generated by the oscillator 38 to send them to the decoder 46, which is adapted to issue a signal on a line 47 when it receives the binary number nine from the counter 44.

The line 47 is directly connected to the storage register 42 to command the transfer of the code combination from the distributor 36 to the storage register 42. The line 47 is moreover connected to the binary counter 44 to bring it back to its initial state and to the start flip-flop 41 to reset this flipi'lop and thus block the oscillator 38. The storage register 42 has eight lines 48,, 48,, "48,, at its output side. Through a corresponding amplifying circuit 50,, 50,4..50; known per se each line 48 normally keeps energized the corresponding electromagnet 49,, 49,,...49,, associated with one unit of the code combination to be printed.

Each electromagnet 49,...49,,, for example 49,, (FIG. 3) normally holds an armature S2 attracted in opposition to the action of a spring 51, the armature being pivoted on a fixed spindle 53. The armature 52 is connected by a pin and slot to a code transfer element constituted by a slider 54 provided with a projection 56in engagement with a notch in a slider 57. This slider is slidable by means of two slots on two fixed spindles 58 and cooperates with a spring-biased positioning detent 59. Each slider 57 is provided with another notch 60 engaging an arm 61 fixed on the pivot 27 of the corresponding code bar 26.

Each slider 54 is provided with two teeth 62 and 63 adapted to cooperate with respective universal bars 64 and 66, pivoted on two fixed spindles 67 and 68 and interconnected by a connecting rod 69. This connecting rod can be actuated by an oscillating actuating member constituted by a lever 71 (FIG. 4) pivoted on a fixed spindle 72 and provided with a lug 73 adapted to cooperate with a shoulder 74 of another lever 76 pivoted on a pin 77 on the connecting rod 69. The lever 71 is provided with a stud 78 engaged in a cam groove 79 of a disc 81 fixed to the shaft 2. The groove 79 has a lobe 82 disposed in correspondence with that angular portion within which the selection clutches 8 can be closed.

The lever 76 (FIG. 4) is normally held by a spring 83 so that I it bears against a lug 84 of a lever 86 with the shoulder 74 out of the path of the lug 73. The spring 83 moreover holds the connecting rod 69 against a fixed stop 87. The lever 86 is pivoted on a fixed spindle 88 and is connected to a slider 89, which cooperates by means of a slot 91 with a pin 93 fixed to a lever 94 turning on the spindle 68, and normally bears against the pin 93 through the action of a spring 92. The lever 94 is adapted to cooperate by means of a lug 97 with one end 98 of the connecting rod 69 and is connected by a pin and slot to an armature 99 turning on the shaft 53. In opposition to the force of a spring 101, the armature 99 is attracted by a release electromagnet 102 normally kept energized, through an amplifying circuit l00,known per se, by the reset output D of a flipflop 103 (FIG. 2) described more fully hereinafter.

Onthe shaft 2 (FIG. 3) there is fixed a cam 104 adapted to cause the oscillation of lever 106 pivoting on the spindle 68 and normally bearing against the profile of the cam 104 through the action of a spring 107. Fixed to the lever 106 is a bar-108 adapted to cooperate with a projection 109 of each of the armatures 52 of the electromagnets 49. On the shaft 2 there is more over fixed another cam 111 (FIG. 4) adapted to cause the oscillation of a lever 112 pivoting on the spindle 68 and connected in turn by a pin slot to an arm 113 fixed on a shaft 114 turning in the frame of the machine. By the action of a spring 116, the arm 113 hOldSQllE lever ll2 bearing against the profile of the cam 111.

On the shaft 114 there is fixed a positioning blade 117 adapted to cooperate with a projection 118 (FIG. 3) of each armature 52. On the blade 117 (FIG. 4) there is moreover formed a bent lug 119 provided with a shoulder 121 adapted to cooperate with a lug 122 of a lever 123 pivoting on the spindie 53 and connected by means of a spring 124 to the armature 99 of the release electromagnet 102. Due to the action of the spring 124, the lever 123 is normally caused to bear against a projection 126 of the armature 99 by means of the lug 122, which in this position constitutes a stop for the bent lug 119 and'thus'normally prevents the positioning blade 117 from engaging the projections 118 (FIG. 3) of the annatures 52 A timing is provided for commanding the transfer of the code combinations received by the electromagnets 49 to the code bars 26, this timing device comprising a disc 127 fixed to the driving shaft 2 and provided at its periphery with two plates 128 and 129 of ferromagnetic material which are fixed to the disc 127 in two angular positions such as to define two arcs, one of which exceeds the other substantially by an angular portion equal to that covered by the shaft 2 in which the clutches 8 cannot be closed or engaged.

Beyond the disc 127 (FIG. 3) there is disposed a signal generator constituted by a magnetic detector 131, the primary of which is fed by a source of direct current 132 (FIG. 2) to create the magnetic field on a core 133. A signal is induced in the secondary of the detector 131 whenever one of the plates 128, 129 (FIG. 3) comes into correspondence with the core 133. The line of the secondary is connected to a circuit 134 (FIG. 2) adapted to transform the two signals into electric pulses of square form of the same-sign and to amplify them and send them to gating inputs A and B, for resetting and setting, respectively, of the flip-flop 103.

When these two inputs are pulsed, the flip-flop 103 will reset, and thus deenergize the electromagnet 102, when the flip-flop 103 receives a signal at an enabling input E pertaining to the gating input A, while the flip-flop 103 will set and thus reenergize the electromagnet 102 when a signal is applied to another enabling input F directly connected to the reset out put D of the flip-flop 103.

The enabling input E OF the flip-flop 103 is connected to the set output 1 of a flip-flop 136. This normally keeps the gating input A inhibited, thus preventing the changing over of the flip-flop 103 and the deenergization of the release electromagnet 102 in spite of the arrival of the signals from the generator 131. The flip-flop 136 can be changed over and thus enable the gating input A of the flip-flop 103 by means of its own set input H connected to the line 47. The flip-flop 136 can be brought back to its initial state by means of the connection of its reset input G to the reset output D of the flip-flop 103 when this is changed over.

The set output 0 of the flip-flop 103 is also connected to the storage register 42 in order to clear it when the flip-flop 103 is changed over again by the gating input 8. Y

The receiving device operates in the following manner.

Normally, the shaft 2 rotates anticlockwise continuously and, through the pulley 3, causes the shaft 7 to rotate in the same sense together with the sleeve 21 and the pinions 19 at an angular velocity one-half that of the shaft 2. The pinions 19 therefore cause the driving parts 14 of the clutches 8 to rotate cyclically in such manner as to presentthe dogs 18 to the teeth 12 and 13 of the driven parts 9 at each in synchronism with the 360 rotation of the shaft 2 (FIGS. 3 and 4), the discs 81 and 127 and the cams 104and 111.

On the reception of the start signal of a code combination on the line 32 (FIG. 2), the flip-flop 41 is changed over, asa result of which, through the medium of the line 39, the oscillator 38 begins to send shift signals on the line 37. These signals are also sent simultaneously to the binary counter 44. The start signal and the eight successive code bits arriving on the line 32 are therefore shifted in sequence into the register 36. Since the register 36 is constituted by only eight flip-flops, the start signal is eliminated on the shifting of the eighth code bit. At the same time, the binary counter 44 sends to the decoding circuit 46 four signals corresponding in binary code to the number of pulses transmitted by the oscillator 38 on the line When the decoding circuit 46 receives the binary number nine, it sends a signal on the line 47, bringing back to their initial state the binary counter 44 and the start flip-flop 41 which latter, in turn, through the medium of the line 39, causes the oscillator 38 to stop. This signal moreover commands the transfer of the code bits present in the register 36 to the storage register 42, as a result of which the eight electromagnets 49,49 are then selectively deenergized in accordance with the corresponding code units received.

Simultaneously, the signal on the line 47 causes the flip-flop 136 to change over, so that the latter, via the line I-E, enables the flip-flop 103 to deencrgize the electromagnet 102 on the arrival of a timing signal from the generator 131. In fact, as soon as one of the ferromagnetic plates 128, 129 passes between the pole pieces of the core 133 of the generator 131,

the two gating inputs A and B of the flip-flop 103 receives a signal. Since the input A has now been enabled, the flip-flop 103 is changed over, so that the release electromagnet 102 is deenergized. At the same time, because of the connection D-F, the gating input B is enabled to change the flip-flop 103 over again, while because of the connetion D-G the flip flop 136 is restored to its initial state, whereby the gating input A is inhibited.

As soon as the electromagnet 102 is deenergized, the levers 99 and 123, biased by the spring 101, turn clockwise until the lever 99 bears against a stop 141. The lever 99 moreover causes the lever 94 to turn anticlockwise until the lug 97 thereof is brought into contact with the shoulder 98 of the connecting rod 69. Moreover, via the slider 89, the lever 94 causes the lever 86 to turn anticlockwise, thus releasing the lever 76. The lever 86 then remains latched in the turned position by means of a shoulder 142 of the lever 76.

If the signal which causes the electromagnet 102 to be deenergized corresponds to the detection of the passage of the ferromagnetic plate 128 (FIG. 3), when the lever 76 (FIG. 4) is released, the lug 73 of the lever 71 is located above the shoulder 74. The spring 83 then causes the lever 76 to turn anticlockwise until the shoulder 74 is brought into the path of the lug 73. The cam 104 (FIG. 3) now causes the lever 106 to turn anticlockwise, so that the universal bar 108, leaving the projections 109 of the armatures 52, allows those armatures corresponding to the electromagnets 49,49 which have been deenergized to turn clockwise, biased by the respective springs 51. The turned armatures 52 then bring the teeth 63 of the corresponding sliders 54 into thepath of the universal bar 66.

Simultaneously, the cam 111 (FIG. 4) allows the lever 112 to turn anticlockwise, so that the arm 113 turns clockwise together with the shaft 114 and the positioning blade 117. The positioning blade then, on the one hand, brings the shoulder 121 into the path of the lug 122 of the lever 123 and, on the other hand, locks the eight armatures 52 (FIG. 3) by means of the blade 117 in the position reached.

Moreover, as soon as the lobe 82 (FIG. 4) of the cam 79 begins to cause the lever 71 to turn anticlockwise, the lug 73 begins to draw the lever 76 downward together with the connecting rod 69, while the ferromagnetic plate 129 (FIG. 3) passes between the pole pieces 133 of the generator 131, so that a second signal is sent to the gating inputs A and B of the flip-flop 103 (FIG. 2). Since the input B is now enabled, the flip-flop 103 is brought back to its initial state, as a result of which the reset output D causes the electromagnet 102 to be reenergized and, via the line D-F, inhibits the input B, while the set output C brings the storage register 42 back to its initial state, thus reenergizing the electromagnets 49 -49 which have been selectively deenergized. The storage register 42 is thus ready to receive a new code combination.

The lobe 82 (FIG. 4) of the, cam "L9 moreover continues to cause the lever 71 to turn anticlockwise, so that the lug 73 draws the lever 76 downward fully together with the connecting rod 69. The two universal bars 64 and 66 (FIG. 3) are therefore turned clockwise until they respectively encounter the teeth 62 of the sliders 54 remaining in the upper position and the teeth 63 of the sliders 54 which have been moved to the bottom. The sliders 54 are thus moved selectively to the right or to the left together with the sliders 57. Through the medium of the arms 61, the sliders 57 position the corresponding code bars 26 (FIG. 1) which, via the levers 22, shift the corresponding driving parts 14 of the clutches 8 during that portion of their cycle in which the dogs 18 are not located at the side of the teeth 13, so that at the beginning of the following cycle the dogs 18 initiate the rotation of the driven part 9 of the clutches 8, which then select the character corresponding to the code combination received, in the manner described in the specification of the said U.S. Pat. No. 3,404,765.

When the connecting rod 69 (FIG. 4) is drawn downward, the shoulder 142 releases the lug 84, as a result of which the lever 86 returns to rest through the action of the spring 92.

Moreover, the connecting rod 69 engages the lug 97 by means of its end 98, causing the lever 94 to turn clockwise. The lever 94, in turn, causes the lever 99 to turn clockwise in opposition to the action of the spring 101 until it is brought into contact with the electromagnet 102, while the lever 123, being retained by the shoulder 121 of the bent lug 119, remains in the position reached.

When the cam groove 79 then causes the lever 71 to turn clockwise, the lug 73 releases the shoulder 74, so that the spring 83 brings the connecting rod 69 to rest together with the universal bars 64 and 66 (FIG. 3). The lever 76 (FIG. 4) is then arrested by the lug 84, so that it turns clockwise, bringing its shoulder 74 back out of the path of the lug 73. Immediately afterwards, the cams 104 and 111 cause both the levers 106 and 1 12 to turn clockwise. As the lever 112 turns clockwise, it causes the arm 1 13 to turn anticlockwise, as a result of which, on the one hand, the blade 117 disengages the projections 1 18 of the armatures 52 and, on the other hand, the shoulder 121 releases the lug 122 of the lever 123 which, biased by the spring 124, jumps anticlockwise, being brought back into the initial position of FIG. 4. 0n the other hand, as the lever 106 (FIG. 3) turns clockwise, it brings the previously selected armatures 52 back to rest immediately thereafter by means of the bar 108 and these armatures are then immediately attracted by the corresponding electromagnets 49,49

If on the other hand, after the electromagnets 49,-49 have been selectively deenergized in accordance with the code combination received, the signal sent to the flipflop 103 which causes the electromagnet 102 to be deenergized corresponds to the detection of the passage of the ferromagnetic plate 129, the blade 117 is now turned completely clockwise and the lever 106 is turned completely anticlockwise. The armatures 52 of the electromagnets 49,-49 selected are therefore locked in the high position by the positioning blade 117. The lug 73 of the lever 71, however, is located below the shoulder 74, so that the lever 76 is temporarily arrested by the lug 73. The shoulder 74 can therefore jump below the lug 73 only after the latter has returned upward.

Thereafter, the cams 104 and 111 actuate the levers 106 and 112, respectively, as hereinbefore described, first bringing them into the position of FIGS. 3 and 4. The blade 117 then releases the projections '1 18 of the armatures 52, while the bar 108 brings the selected armatures 52 back to rest. Immediately afterwards, the lever 106 returns to the position in which it is turned completely anticlockwise in FIG. 3, again releasing the armatures 52 now selected, while the lever 112 returns clockwise in FIG. 4, locking the armatures 52 by means of the blade 117 in the position reached.

As soon as the blade 117 has again locked the armatures 52 selected, the ferromagnetic plate 128 passes between the pole pieces of the generator 131, so that a second signal is sent to the flip-flop 103. As hereinbefore described, this flip-flop is then brought back to its initial state and, on the one hand, reenergizes the electromagnet 102 and, on the other hand, via the set output C, brings the storage register 42 back to its initial state, causing the electromagnets 49 -49 which have been selectively deenergized to be reenergized. The storage register is thus ready to receive a new code combination. The cam groove 79 then causes the universal bars 64 and 66 to turn as in the previous case.

We claim:

1. A receiving device for code combinations for a teleprinter of the start-stop type, having a printing mechanism cyclically operable to print a received character, a start electromagnet for conditioning said mechanism for operation, a storing register for storing the code combination of the character to be printed, and a series of code electromagnets to control said mechanism to select the character to be printed in accordance with said code combination, wherein the improvement comprises means for providing a character ready signal in response to receipt of a code combination, a control circuit responsive to said character ready signal to change from a first state to a second state to actuate said start electromagnet, and

delay means controlled by said mechanism to reset said control circuit to the first state with a predetermined delay with respect to the actuation of the start electromagnet, said control circuit being arranged to clear said register on reverting to the first state.

2. A device according to claim I, wherein said delay means comprise signal generator means for generating a signal adapted to reset said control circuit to its first state, and at least one element movable synchronously with the cyclic operation of said mechanism and adapted to trigger said signal generator means.

3. A device according to claim 1, comprising a shift register adapted to be conditioned by a received start signal to receive the signals of the code combination in series under the control of said character ready signal, said storing register being arranged to be filled in parallel upon being cleared by said shifi register, said character ready signal providing means being adapted to block the further reception of signals in said shift register upon said storage register being filled.

4. A device according to claim 3, wherein said character ready signal providing means comprises a signal counter and a timing device controlling said signal counter and the input of the signals of the code combination into said shift register.

5. A device according to claim 1, wherein said printing mechanism is adapted to be actuated synchronously and cyclically by a continuously rotating driving shaft and comprises a selector for selecting the character to be printed, said selector being prearranged by said code electromagnets during a predetermined part of the revolution of the shaft, said delay means being adapted to generate two timing signals in each revolution of said shaft, said control circuit being set into the second state by either one of the timing signals in the presence of the character ready signal and being reset to its first state by the other of the timing signals.

6. A device according to claim 5, wherein said control circuit comprises a bistable circuit adapted to be changed over by the successive timing signals, said bistable circuit being alternately conditioned by the character ready signal to be set into its second state and by the existence of the second state to be reset to its first state.

7. A device according to claim 6, wherein said control circuit further comprises a flip-flop coupled to said bistable circuit and adapted to be brought into a first state by said character ready signal and to be brought into a second state in consequence of the changeover of said bistable circuit to its second state, in the second state said flip-flop being adapted to pass on the character ready signal to said bistable circuit.

8. A device according to claim 5, wherein said delay means comprise a signal generator means for generating a signal for resetting said control circuit to its first state, at least one element movable synchronously with the cyclic'operation of said mechanism and adapted to trigger said signal generator means, said device further comprising means for preventing said selector from being prearranged during the remaining part of the revolution of said shaft, each of said two timing signals being generated by said generator by sensing one of two elements fixed to said driving shaft in two angular positions to define two different intervals of time for each revolution of said shaft, one of these intervals exceeding the other interval substantially by the time required by said shaft to cover the said remaining part of the revolution.

9. A device according to claim 8, further comprising a series of transfer elements adapted to be prearranged by said code electromagnets to set a series of code bars included in said selector, and at least one universal bar actuatable rhythmically by said shaft for actuating said transfer elements so prearranged under the control of said start electromagnet.

10. A device according to claim 9, wherein said code electromagnets are provided with arrnatures connected individually to each one of said transfer elements, another universal bar actuated rhythmically by said driving shaft prior to the said actuation being adapted to release said arrnatures. 1 1. A device according to claim 10, further comprising POSI- tioning means actuated rhythmically by said shaft after operation of said further universal bar for locking said armatures in the positions assumed in accordance with the received code combination. 

1. A receiving device for code combinations for a teleprinter of the start-stop type, having a printing mechanism cyclically operable to print a received character, a start electromagnet for conditioning said mechanism for operation, a storing register for storing the code combination of the character to be printed, and a series of code electromagnets to control said mechanism to select the character to be printed in accordance with said code combination, wherein the improvement comprises means for providing a character ready signal in response to receipt of a code combination, a control circuit responsive to said character ready signal to change from a first state to a second state to actuate said start electromagnet, and delay means controlled by said mechanism to reset said control circuit to the first state with a predetermined delay with respect to the actuation of the start electromagnet, said control circuit being arranged to clear said register on reverting to the first state.
 2. A device according to claim 1, wherein said delay means comprise signal generator means for generating a signal adapted to reset said control circuit to its first state, and at least one element movable synchronously with the cyclic operation of said mechanism and adapted to trigger said signal generator means.
 3. A device according to claim 1, comprising a shift register adapted to be conditioned by a received start signal to receive the signals of the code combination in series under the control of said character ready signal, said storing register being arranged to be filled in parallel upon being cleared by said shift register, said character ready signal providing means being adapted to block the further reception of signals in said shift register upon said storage register being filled.
 4. A device according to claim 3, wherein said character ready signal providing means comprises a signal counter and a timing device controlling said signal counter and the input of the sigNals of the code combination into said shift register.
 5. A device according to claim 1, wherein said printing mechanism is adapted to be actuated synchronously and cyclically by a continuously rotating driving shaft and comprises a selector for selecting the character to be printed, said selector being prearranged by said code electromagnets during a predetermined part of the revolution of the shaft, said delay means being adapted to generate two timing signals in each revolution of said shaft, said control circuit being set into the second state by either one of the timing signals in the presence of the character ready signal and being reset to its first state by the other of the timing signals.
 6. A device according to claim 5, wherein said control circuit comprises a bistable circuit adapted to be changed over by the successive timing signals, said bistable circuit being alternately conditioned by the character ready signal to be set into its second state and by the existence of the second state to be reset to its first state.
 7. A device according to claim 6, wherein said control circuit further comprises a flip-flop coupled to said bistable circuit and adapted to be brought into a first state by said character ready signal and to be brought into a second state in consequence of the changeover of said bistable circuit to its second state, in the second state said flip-flop being adapted to pass on the character ready signal to said bistable circuit.
 8. A device according to claim 5, wherein said delay means comprise a signal generator means for generating a signal for resetting said control circuit to its first state, at least one element movable synchronously with the cyclic operation of said mechanism and adapted to trigger said signal generator means, said device further comprising means for preventing said selector from being prearranged during the remaining part of the revolution of said shaft, each of said two timing signals being generated by said generator by sensing one of two elements fixed to said driving shaft in two angular positions to define two different intervals of time for each revolution of said shaft, one of these intervals exceeding the other interval substantially by the time required by said shaft to cover the said remaining part of the revolution.
 9. A device according to claim 8, further comprising a series of transfer elements adapted to be prearranged by said code electromagnets to set a series of code bars included in said selector, and at least one universal bar actuatable rhythmically by said shaft for actuating said transfer elements so prearranged under the control of said start electromagnet.
 10. A device according to claim 9, wherein said code electromagnets are provided with armatures connected individually to each one of said transfer elements, another universal bar actuated rhythmically by said driving shaft prior to the said actuation being adapted to release said armatures.
 11. A device according to claim 10, further comprising positioning means actuated rhythmically by said shaft after operation of said further universal bar for locking said armatures in the positions assumed in accordance with the received code combination. 